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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Provision for income taxes		$ 164	$ 55	$ 584	$ 98
Charitable contribution, expiry period				2019
Low-income housing, expiry period				2034
Net operating loss carryforwards, expiry period				2032
Cumulative loss position, representing significant negative evidence against the realizability of the deferred tax asset	3 years			3 years

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- Definition

Cumulative loss position, significant negative evidence against the realizability of the deferred tax asset.

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- Definition

Deferred Tax Assets Charitable Contribution Carryforwards Expiration Period

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- Definition

Deferred Tax Assets Low Income Housing Credit Carryforward Expiration Period

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- Definition

Deferred Tax Assets Operating Loss Carryforwards Expiration Period

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- Definition

Provision for income taxes related to net security gains.

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